163980305856 has 84 divisors (see below), whose sum is σ = 470220306192. Its totient is φ = 54636801024.

The previous prime is 163980305789. The next prime is 163980305893. The reversal of 163980305856 is 658503089361.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1318885 + ... + 1437851.

It is an arithmetic number, because the mean of its divisors is an integer number (5597860788).

Almost surely, 2^163980305856 is an apocalyptic number.

163980305856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

163980305856 is an abundant number, since it is smaller than the sum of its proper divisors (306240000336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163980305856 is a wasteful number, since it uses less digits than its factorization.

163980305856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121378 (or 121365 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 163980305856 in words is "one hundred sixty-three billion, nine hundred eighty million, three hundred five thousand, eight hundred fifty-six".